/*
 * Copyright (c) 2008 Princeton University
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met: redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer;
 * redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution;
 * neither the name of the copyright holders nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * Authors: Niket Agarwal
 */

#include "mem/ruby/network/garnet-fixed-pipeline/InputUnit_d.hh"
#include "mem/ruby/network/garnet-fixed-pipeline/Router_d.hh"

InputUnit_d::InputUnit_d(int id, Router_d *router)
{
        m_id = id;
        m_router = router;
        m_num_vcs = m_router->get_num_vcs();

        m_num_buffer_reads = 0;
        m_num_buffer_writes = 0;

        creditQueue = new flitBuffer_d();
        // Instantiating the virtual channels
        m_vcs.setSize(m_num_vcs);
        for(int i=0; i < m_num_vcs; i++)
        {
                m_vcs[i] = new VirtualChannel_d(i);
        }
}

InputUnit_d::~InputUnit_d()
{
        delete creditQueue;
        m_vcs.deletePointers();
}

void InputUnit_d::wakeup()
{
        flit_d *t_flit;
        if(m_in_link->isReady())
        {
                t_flit = m_in_link->consumeLink();
                int vc = t_flit->get_vc();
                if((t_flit->get_type() == HEAD_) || (t_flit->get_type() == HEAD_TAIL_))
                {
                        assert(m_vcs[vc]->get_state() == IDLE_);
                        m_router->route_req(t_flit, this, vc); // Do the route computation for this vc
                        m_vcs[vc]->set_enqueue_time(g_eventQueue_ptr->getTime());
                }
                else
                {
                        t_flit->advance_stage(SA_);
                        m_router->swarb_req();
                }
                m_vcs[vc]->insertFlit(t_flit);   // write flit into input buffer
                m_num_buffer_writes++;
                m_num_buffer_reads++; // same as read because any flit that is written will be read only once
        }
}


void InputUnit_d::printConfig(ostream& out)
{
        out << endl;
        out << "InputUnit Configuration" << endl;
        out << "---------------------" << endl;
        out << "id = " << m_id << endl;
        out << "In link is " << m_in_link->get_id() << endl;
}
